Was researching the net today for EC2 managment utilities and stumbled on this blog post on Crunch Tools. Mentioned Overmind, a very promising web application to manage all my cloud instances from a centralised point. According to their GitHub page, Overmind aims to provider a complete server provisioning and configuration management application.
The first version is a unified front-end to public and private clouds, custom server providers and dedicated hardware. Its based on Python, Django Web Framework and libcloud.